For DSC the min BPC is 8 for ICL+ and so the min pipe_bpp is 24.
Check this condition for cases where bpc is forced by debugfs flag
dsc_force_bpc. If the check fails, then WARN and ignore the debugfs
flag.
For MST case the pipe_bpp is already computed (hardcoded to be 24),
and this check is not required.
Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 48 ++++++++++++++++---------
1 file changed, 31 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index f41de126a8d3..78ac8f4fd348 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1697,6 +1697,12 @@ u8 intel_dp_dsc_min_src_input_bpc(struct
drm_i915_private *i915)
return 0;
}
+static
+bool is_dsc_pipe_bpp_sufficient(struct drm_i915_private *i915, int pipe_bpp)
+{
+ return pipe_bpp >= intel_dp_dsc_min_src_input_bpc(i915) * 3;
+}
+
int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state,
@@ -1708,7 +1714,6 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
const struct drm_display_mode *adjusted_mode =
&pipe_config->hw.adjusted_mode;
- int pipe_bpp;
int ret;
pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
@@ -1720,28 +1725,37 @@ int intel_dp_dsc_compute_config(struct intel_dp
*intel_dp,
if (!intel_dp_dsc_supports_format(intel_dp, pipe_config->output_format))
return -EINVAL;
- if (intel_dp->force_dsc_bpc && compute_pipe_bpp) {
- pipe_bpp = intel_dp->force_dsc_bpc * 3;
- drm_dbg_kms(&dev_priv->drm, "Input DSC BPC forced to %d\n",
- intel_dp->force_dsc_bpc);
- } else if (compute_pipe_bpp) {
- pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp,
conn_state->max_requested_bpc);
- } else {
- pipe_bpp = pipe_config->pipe_bpp;
- }
+ if (compute_pipe_bpp) {
+ int pipe_bpp;
+ int forced_bpp = intel_dp->force_dsc_bpc * 3;
- if (pipe_bpp < intel_dp_dsc_min_src_input_bpc(dev_priv) * 3) {
- drm_dbg_kms(&dev_priv->drm,
- "Computed BPC less than min supported by source for
DSC\n");
- return -EINVAL;
+ if (forced_bpp && is_dsc_pipe_bpp_sufficient(dev_priv,
forced_bpp)) {
+ pipe_bpp = forced_bpp;
+ drm_dbg_kms(&dev_priv->drm, "Input DSC BPC forced to
%d\n",
+ intel_dp->force_dsc_bpc);
+ } else {
+ drm_WARN(&dev_priv->drm, forced_bpp,
+ "Cannot force DSC BPC:%d, due to DSC BPC
limits\n",
+ intel_dp->force_dsc_bpc);
+
+ pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp,
+
conn_state->max_requested_bpc);
+
+ if (!is_dsc_pipe_bpp_sufficient(dev_priv, pipe_bpp)) {
+ drm_dbg_kms(&dev_priv->drm,
+ "Computed BPC less than min
supported by source for DSC\n");
+ return -EINVAL;
+ }
+ }
+
+ pipe_config->pipe_bpp = pipe_bpp;
}
/*
- * For now enable DSC for max bpp, max link rate, max lane count.
+ * For now enable DSC for max link rate, max lane count.
* Optimize this later for the minimum possible link rate/lane count
* with DSC enabled for the requested mode.
*/
- pipe_config->pipe_bpp = pipe_bpp;
pipe_config->port_clock = limits->max_rate;
pipe_config->lane_count = limits->max_lane_count;
@@ -1770,7 +1784,7 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
adjusted_mode->crtc_hdisplay,
pipe_config->bigjoiner_pipes,
pipe_config->output_format,
- pipe_bpp,
+
pipe_config->pipe_bpp,
timeslots);
if (!dsc_max_compressed_bpp) {
drm_dbg_kms(&dev_priv->drm,
--
2.40.1
